The Sonian Forest, Foret de Soignes, or Zoniënwoud, an 11,000 hectare woodland to the southeast of Brussels, providing a "green lung" for the polluted, traffic choked city. The forest is currently in three jurisdictions, Brussels, Flanders and Wallonia, but EU involvement in 2013 will see development of plans to re-unify the forest, for the benefit of humans and wildlife.